Seattle grunge act Soundgarden will celebrate the 20th anniversary of their most successful album, "Superunknown," by performing the collection in its entirely for the first time ever later this month.

The established alt-rockers, helmed by Chris Cornell, will tackle the entire chart-topping effort during a March 13 appearance at the iTunes Festival, which is a part of the 27th annual South by Southwest Music, Film and Interactive Conference (SXSW).

The concert will take place at Austin's ACL Live at Moody Theater, which hosts the famed "Austin City Limits" music program on PBS affiliates nationwide. The concert will also stream live via the iTunes store, as well as the iTunes Festival app.

Other acts performing at the iTunes Festival at SXSW include Coldplay, Pitbull, Keith Urban, Willie Nelson and Imagine Dragons.

In other SXSW-related news, Lady Gaga's plan to perform at the Doritos Stage at SXSW has failed due to a denied city permit.

"Our conclusion was based primarily on public safety concerns," said Don Pitts, manager of the City of Austin Music & Entertainment division, told Austin360. "We look at the size and capacity of the location covered by the permit being sought and how it fits with the anticipated attendance, based on event capacity and promotion. At the end of the day, it's a parking lot."

The denied permit for the oversized vending machine stage doesn't mean Gaga won't appear. Pitts also said the city would support relocation to a venue with a more appropriate infrastructure for the size of the expected crowd, though no specific spot has been confirmed.